I found an older thread here that outlines there are 2 places the config could be. I found mine under /usr/lib/NetworkManager/conf.d/20-connectivity.conf
I have tried just commenting out all settings to see if It can just be ignored as I am on a Desktop at home with ethernet not wifi.
I think it would be great to move this to something like a Cloudflare page with a worker to set the required headers. that way we can use the always online feature to ensure even when the website has work to do it won’t cause this issue.